Damper.



L. J. MUELLER, JR. v

v DAMPER.

APPLICATION FILED MAY 8, 1911.

"1,023,866. Patented Apr, 23, 1912.

Witnesses Iwve arorl imam Y UNTTED STATES PATENT OFFICE.

LOUIS J. MUELLER, JR., OF MILWAUKEE, WISCONSIN.

DAMPER.

To all whom it may c0nccm:

Be it known that I, LoUIs J. MUELLER, Jr., a citizen of the UnitedStates, residing at Milwaukee, in the county of Milwaukee and State oflVisconsin, have invented certain new and useful Improvements inDampers, of which the following is a specification, reference being hadto the accompanying drawing, forming a part thereof.

This invention relates to dampers and similar valves and the objects ofthe invention are to provide constructions to hold dampers lockediinmovably in different positions of adjustment while at the same timepermitting the position of a damper to be readily and easily changed.

Referring to the drawings which accompany this specification and form apart thereof, which drawings illustrate an embodiment of this invention,and on which drawings the same reference characters are used todesignate the same elements wherever they may appear in each of theseveral views, Figure 1 is a vertical, transverse sectional view of aflue having a damper therein, taken on the line aa Fig. 2, looking inthe direct-ion indicated by the arrows; and Fig. 2 is a side elevationof the flue taken on the line Z)Z) Fig. 1, looking in the directionindicated by the arrows, the damper shank or shaft being shown insection.

Referring specifically to the drawings, the reference numeral 1designates a flue or conduit having a damper 2 located therein. The fluehas two apertures 3 and l diametrically opposite each other and thedamper shank or shaft 5 projects into each of said apertures as clearlyshown by the drawings. The damper shank or shaft 5 may be formedseparately from the damper or may be formed integrally therewith, andthis specific construction forms no part of this invention. In thespecific construction illustrated by the drawings the damper shank orshaft 5 is shown as a separate member to which the damper 2 is securedin a well known manner. The damper shank or shaft is formed into acylindrical trunnion 6 at one end and is provided with a handle 7 at itsother end. A cotter pin 9 may be used to prevent displacement of theparts. The damper shank 5 is provided with a part which is of polygonalshape in cross section and which is designated by the reference numeral10. Preferably the cross sectional Specification of Letters Patent.

Application filed May 8, 1911.

Patented'Apr. 23, 1912 Serial No. 625,878.

shape of this part 10 is that of a regular polygon of three or moreequal sides depending on the number of different positions in which itmay be desirable to lock the damper. By making the part 10 of a regularpolygonal shape in cross section the damper can be turned entirely overto change the face presented to hot gases, for example, but it will bereadily understood that practically only the bottom side of part 10 isrequired to be of regular polygonal shape. The upper part of aperture 4is large enough for the part 10 to be revolved freely therein but thelower part of aperture 4 conforms in polygonal shape to the shape of thepart 10 of the damper shank or shaft. A flange or Washer 11 on thedamper shank or shaft 5 covers the aperture 4.

The use of the construction is obvious. The flue 1 is set so that thepolygonal part of the aperture 4 is lowermost. When the polygonal part10 of the damper shank or shaft 5 is in its lower position as shown byFig. 2 of the drawings, the damper is securely locked against rotationeither by the draft through the flue or by accidental blows against thehandle. The damper can only be turned by first elevating the handle so ithat the polygonal part 10 on the damper shank can be revolved in theenlarged upper part of aperture 4.

What is claimed is:

1. The combination with a flue provided with a substantially verticalelongated aperture, the lower part of which is of polygonal shape andthe upper part of which is larger than the polygonal-shaped lower part,of a damper provided with a poly onal-shaped damper shank adapted torest within the lower polygonal-shaped part of said aperture in the flueto hold the damper immovably locked in position, the said polyonal-shaped damper shank being adapted to be lifted into the upperlarger part of said aperture and to be rotated therein, whereby theadjustment of the damper may be changed.

2. The combination with a flue provided with a substantially verticalelongated aperture, the lower part of which is of polygonal shape andthe upper part of which is larger than the polygonal-shaped lower part,of a damper provided with a polygonalshaped damper shank adapted to restwithin the lower polygonal-shaped part of said aperture in the flue tohold the damper immovably locked in position, the said polygonal- InWitness whereof I hereto aflix my sigshaped damper shank being adaptedto he nature in presence vof two Witnesses. hfted lnto the upper largerpart of sald LOUIS J. MUELLER, JR

aperture and to be rotated therein, whereby the adjustment of the dampermay be WVitnesses:

changed, and a flange on the damper-shank JOSEPH H. BOLZINGER, to coverthe aperture in the flue. EDWIN S. SEIMs.

Copies of this patent may he obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

